Chimney-cowl.



iv 5 s NU. 839,475. IATENTBD DEC. 25, 1906.

f H. GUTSCHMIDT.

CHIMNBY COWL. Arrmonlox FILED NH12, 1906.

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HERMANN GUTSCHMIDT, OF JERSEY CITY HEIGHTS, NEW JERSEY.

CHlMNEY-COWL.

Specification of Letters Patent.

Application filed May 12.1906. Serial No. 316,522.

Patented Dec. 25, 1906.

To (LN/whom, it may concern.'

Beit known that I, HERMANN Gnrscmnnr, a citizen of the United Statesof,America, and a resident of Jersey City Heights, in the county of Hudsonand State of New Jersey, have invented certain new and useful Im- 'lprovements in Chimney-Cowls, of which the following is a specification.

My invention relates to chimney and ventilater cowls suoli as aredesigned to pievent a reversal of draft in a chimney or Ventilatingflue,due to more or less downwardly-directed atmospheric current-s whichmight be caused, for example, by taller neighboring buildings.

My object is to produce a device of this nature that is an improvementin being at g once simple in construction and entirely efficient inoperation.

W'ith this end in view I have employed as principal elements a cap I@Ver nml extending downward to DelOW the top of an extension for thechimney on the i' outside thereof and with a space between, a

hood having a small opening at the top and open at the bottom andsurrounding and extending to below the cap, and a hood-shaped i ,if

The invention will be further explained by referring to the accompanyingdrawings, in Which- Figure 1 is a plan view of the device, and

- Fig. 2 a vertical central section, some of the lowest portion beingbroken away.

In the drawings, 1 is a flue portion which may be attached to and fornian extension of any w-*eiitilating-ilue or chimney to which theinvention is to be applied.

Concentrict ally over the ilue 1 is the cap 2, which may be held inplace by the brackets 3.

The cap 'g 2 has a conical portion 2a and a cylindrical portion 2b, andit is to be noted as of the greatest importance that the cylindricalportion 2b extends to some distance below the 'top edge of the liucportion 1. Tests show that. if this is not done the back pressureagainst the draft in the flue is increased. However, this cap alone isnot sufficient for the purpose. Therefore additional parts are provided,'each one of which has been found fr l by experiment to be essential tothe best results in operation.

Inside of the cap 2 and supported in any convenient manner, as by thebrackets 3, is a hood-shaped pla-te 4. The plate 4 is inade up of thetrunco-eonical portion 4, and the cylindrical portion 4b is parallel tothe corresponding parts of the cap 2 and provides the passages 5 and 6,which form annular openings for the exit of the smoke or air from theflue 1. It is to be particularly noted that the lower edge of the part4b of the plate 4 occupies a lower horizontal plane than the top edge ofthe flue 1, but not so low as the lower edge of the cap 2, also that theaperture 7 at the top of the portion 4 is of much smaller area than thefine 1. However, the space between the plate 4 and the flue 1, formingthe passage 5, should throughout be equal in area to the llue 1.

Disposed outside of the cap 2 is an external hood 8, parallel to the cap2 and forming the passage 9. cylindrical portion Sa and upper and lowertruncated conical portions 8b and 8, respectively, and itis to be notedas of importance that the cylindrical portion 8 extends to bel'ow thelower edge of the part 2b of the cap 2. The lower part 8 forms arotector around the bottoni, leaving an annu ar opening at 10. The hoodS may be conveniently supported by the brackets 3. It should be 'lhehood 8 is composed of a noted that the truncated portion 8b has only avery small opening 11 at the top, while the Y opening at 10 is large,being about equal to the passage 5 or to the Hue 1, thus allowing freeegress of smoke and air at this point. The part 8c has a gentle inwardslope to avoid a sharp turn at the end of the passage 9.

Normally in a chimney or Ventilatingiue-that is, when there are nointerfering atmospheric currentsthe most of the smoke or air from theliuc 1 will pass downward and out at the opening 10; but a smallquantity will escape through the opening 11. A. straight horizontal windby blowing across the o ,enings 11 at the top and 10 at the bottonilIias the etl'ect, about the same as in an unprotected chimney, tosomewhat increase the draft on the principle used in an atomizer. Shouldthe wind come at a downward angle or vertically downward, the most of itwill be simply turned aside, but a small amount of it will enter at theopening 11 into the upper end of the passage 9 and pass out IOO IIO

l l F i i' l v at the lower end thereof, carrying along with f to achimney, an imperforate cap over said it the smoke or air coming fromthe passage 6 and which in turn acts likewise upon that 1 which isemerging by the opening 5 from the flue 1. The opening 11 should besmall, (about in the proportion shown,) for if it be large it has beenfound that downward aircurrents cause too strong a draft in the flue 1.However, it should be present to give a slight assistance and tocounteract the opposite effect of any eddies which might be formed in- IIt is to be i the lower part of the hood 8. noted that the downwardclurent of air from the passage 9 does not blow across the mouth of theopening 5 nor of the passage 6, but that I it is injected downward intothe streams issuing therefrom, being deflected inwardly by the part 8C,the entire mixture inally having exit at the opening 10. The principleappears to be similar to that of the injector and to produce a siphoningell'ect in the passage 6, which draws from the flue 1 through theaperttue 7. The aperture 7 must be smaller than the flue 1 about in theproportion shown, so as to properly divide the smoke or air issuingfromthe flue 1, causing most of it to pass through the opening 5, butproviding also additional means of escape and adequately supplying thepassage 6. The device has been found less eflicient without the plate 4.Should the wind strike at an upward angle, it is turned aside by theoutside of the protector 8c on the side from which the wind is comingand at the other side what enters is caught by the inside surface of 8Cand deflected upward through the passage 9, and what does not find itsway out by the aperture 11 will return along the opposite side of thehood and there be of assistance instead of harmful. l t is preventedfrom being deflected into the flue 1 bythe cap 2 and the plate 4.However, irrespective of any theories as to just how or why the deviceof the invention has been found to be absolutely effective in fullsizedoperative devices in use it has also been found by experiment that noneof the parts shown and described can be dispensed with.

The invention of course might be modified in minor particulars withoutdeparting from the essentials thereof; but the scope of the invention isattended to in the annexed claims.

The materials to be used in construction and the manner of cuttingandoining them together to form the complete evice are familiar' tothose versed in the art and need not bel detailed here.

I claim as my invention- 1. A chimney-cowl consisting of the combinationof a flue forforming a continuation from said cap and flue and spacedfrom and extending downward on the outside of said flue with its loweredge in a horizontal plane below the top of said flue, a plate spacedfrom the inside of said cap and from the outside of said flue and havinga central opening over said flue and said plate extending downwardlybelow the upper edge of said flue but not so low as the lower edge ofsaid cap, and a hood spaced outward from said cap and having a centralopening at its top and open at its bottoni and extending downward belowthe lower edge of said cap.

2. A chimney-cowl consisting of the combination of a flue for forming acontinuation to a chimney, an imperforate conical cap over said flue,said cap having a lower vertical portion extending down on the outsideof said flue to below the top thereof and spaced therefrom, a platewithin said cap, said plate having a vertical cylindrical portionextending downward below the upper edge ol said fiue but not so low asthe lower edge of said cap, and an upper portion extending inwardly inthe form of a truncated cone, leaving an opening at the top smaller thansaid flue, all portions being parallel to and spaced spaced outwardlyfrom said flue so as to leave an area equal to said flue, a hoodsurrounding said cap, said hood having a middle cylindrical portionextending downward to below the lower edge of said cap, and upper andlower portions extending inwardly in the form of truncated cones, cavingan opening at the top smaller than said flue, the said middle and upperportions being parallel to and spaced from said cap, and supports forretaining said cap, plate and hood in place upon said flue.

3. In a chimney-cowl, the combination of a fine, a cap over said flueand extending to below the top thereof on the outside thereof, a hoodopen at the top and bottom and surrounding said cap and extending tobelow said cap, and a plate within said cap and extending from above tobelow the top of said flue.

4. In a chimney-cowl the combination of a flue having its end open, andguides forming an unbroken passage for the wind from above to below theopen end of said flue on the outside thereof, and also forming unbrokenpassages for the flue contents from within said flue to below the openend thereof.

HERMANN GUTseinuD'r. [n s.]

